Esql Sample

This sample consists of a command line SQL parser. SQL statements are filtered through a monitor and sent to the RDBMS.

Compiling

To compile the example:

• Launch EiffelStudio.
• Click Add project
• Browse to $ISE_EIFFEL\examples\store\esql\.
• Choose esql.ecf
• Choose the location where the project will be compiled, by default the same directory containing the configuration file.
• Choose the targe according to the installed DBMS.
• Click OK.

Running

This sample lets you interact with your database through a console.

First you have to enter the database connection information:

• For ODBC:

Database user authentication: Data Source Name: handson Name: smith Password: mypass

Note: Name and Password are not required with ODBC. If you don't need Name and Password, you can simply hit Return when prompted.

• For Oracle:

Database user authentication: Name: smith@HANDSON Password: mypass

Note: You must specify the Oracle User Name and Net Service Name with the syntax <user>@<service> where <user> stands for the User Name and <service> stands for the Net Service Name.

Then you can enter standard SQL queries to interact with your database, for instance: SQL> select firstname, lastname from CONTACTS where lastname = 'Smith' John Smith SQL>

Note: Enter exit to quit the application.

==Under the Hood== This sample showcases the use of the 3 basic classes to interact with your database: * DB_CONTROL to connect and disconnect to your database. * DB_SELECTION to perform 'select' queries. * DB_CHANGE to perform SQL queries that output no result. The whole sample code is contained in the root class: * ESQL for Oracle. * ESQL_ODBC for ODBC.